block: Make the block accounting functions operate on BlockAcctStats

This is the next step for decoupling block accounting functions from
BlockDriverState.
In a future commit the BlockAcctStats structure will be moved from
BlockDriverState to the device models structures.

Note that bdrv_get_stats was introduced so device models can retrieve the
BlockAcctStats structure of a BlockDriverState without being aware of it's
layout.
This function should go away when BlockAcctStats will be embedded in the device
models structures.

CC: Kevin Wolf <kwolf@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Keith Busch <keith.busch@intel.com>
CC: Anthony Liguori <aliguori@amazon.com>
CC: "Michael S. Tsirkin" <mst@redhat.com>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Eric Blake <eblake@redhat.com>
CC: Peter Maydell <peter.maydell@linaro.org>
CC: Michael Tokarev <mjt@tls.msk.ru>
CC: John Snow <jsnow@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
CC: Alexander Graf <agraf@suse.de>
CC: Max Reitz <mreitz@redhat.com>

Signed-off-by: Benoît Canet <benoit.canet@nodalink.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

13 files changed, 108 insertions, 79 deletions

diff --git a/block.c b/block.c
index 1fac189..dda5ae9 100644
--- a/block.c
+++ b/block.c
@@ -3363,7 +3363,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
 
     bdrv_set_dirty(bs, sector_num, nb_sectors);
 
-    bdrv_acct_highest_sector(bs, sector_num, nb_sectors);
+    block_acct_highest_sector(&bs->stats, sector_num, nb_sectors);
 
     if (bs->growable && ret >= 0) {
         bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors);
@@ -6087,3 +6087,14 @@ void bdrv_refresh_filename(BlockDriverState *bs)
         QDECREF(json);
     }
 }
+
+/* This accessor function purpose is to allow the device models to access the
+ * BlockAcctStats structure embedded inside a BlockDriverState without being
+ * aware of the BlockDriverState structure layout.
+ * It will go away when the BlockAcctStats structure will be moved inside
+ * the device models.
+ */
+BlockAcctStats *bdrv_get_stats(BlockDriverState *bs)
+{
+    return &bs->stats;
+}
diff --git a/block/accounting.c b/block/accounting.c
index 38932ca..edbb1cc 100644
--- a/block/accounting.c
+++ b/block/accounting.c
@@ -25,9 +25,8 @@
 #include "block/accounting.h"
 #include "block/block_int.h"
 
-void
-bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes,
-        enum BlockAcctType type)
+void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
+                      int64_t bytes, enum BlockAcctType type)
 {
     assert(type < BLOCK_MAX_IOTYPE);
 
@@ -36,22 +35,20 @@ bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes,
     cookie->type = type;
 }
 
-void
-bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie)
+void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie)
 {
     assert(cookie->type < BLOCK_MAX_IOTYPE);
 
-    bs->stats.nr_bytes[cookie->type] += cookie->bytes;
-    bs->stats.nr_ops[cookie->type]++;
-    bs->stats.total_time_ns[cookie->type] += get_clock() -
-                                             cookie->start_time_ns;
+    stats->nr_bytes[cookie->type] += cookie->bytes;
+    stats->nr_ops[cookie->type]++;
+    stats->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns;
 }
 
 
-void bdrv_acct_highest_sector(BlockDriverState *bs, int64_t sector_num,
-                              unsigned int nb_sectors)
+void block_acct_highest_sector(BlockAcctStats *stats, int64_t sector_num,
+                               unsigned int nb_sectors)
 {
-    if (bs->stats.wr_highest_sector < sector_num + nb_sectors - 1) {
-        bs->stats.wr_highest_sector = sector_num + nb_sectors - 1;
+    if (stats->wr_highest_sector < sector_num + nb_sectors - 1) {
+        stats->wr_highest_sector = sector_num + nb_sectors - 1;
     }
 }
diff --git a/dma-helpers.c b/dma-helpers.c
index 499b52b..f6811fa 100644
--- a/dma-helpers.c
+++ b/dma-helpers.c
@@ -277,5 +277,5 @@ uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg)
 void dma_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
                     QEMUSGList *sg, enum BlockAcctType type)
 {
-    bdrv_acct_start(bs, cookie, sg->size, type);
+    block_acct_start(bdrv_get_stats(bs), cookie, sg->size, type);
 }
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index f9aec24..b010c9b 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -197,7 +197,7 @@ static void nvme_rw_cb(void *opaque, int ret)
     NvmeCtrl *n = sq->ctrl;
     NvmeCQueue *cq = n->cq[sq->cqid];
 
-    bdrv_acct_done(n->conf.bs, &req->acct);
+    block_acct_done(bdrv_get_stats(n->conf.bs), &req->acct);
     if (!ret) {
         req->status = NVME_SUCCESS;
     } else {
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index c2cb815..38ad38f 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -74,7 +74,7 @@ static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
         s->rq = req;
     } else if (action == BLOCK_ERROR_ACTION_REPORT) {
         virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
-        bdrv_acct_done(s->bs, &req->acct);
+        block_acct_done(bdrv_get_stats(s->bs), &req->acct);
         virtio_blk_free_request(req);
     }
 
@@ -96,7 +96,7 @@ static void virtio_blk_rw_complete(void *opaque, int ret)
     }
 
     virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
-    bdrv_acct_done(req->dev->bs, &req->acct);
+    block_acct_done(bdrv_get_stats(req->dev->bs), &req->acct);
     virtio_blk_free_request(req);
 }
 
@@ -111,7 +111,7 @@ static void virtio_blk_flush_complete(void *opaque, int ret)
     }
 
     virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
-    bdrv_acct_done(req->dev->bs, &req->acct);
+    block_acct_done(bdrv_get_stats(req->dev->bs), &req->acct);
     virtio_blk_free_request(req);
 }
 
@@ -279,7 +279,8 @@ void virtio_submit_multiwrite(BlockDriverState *bs, MultiReqBuffer *mrb)
 
 static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb)
 {
-    bdrv_acct_start(req->dev->bs, &req->acct, 0, BLOCK_ACCT_FLUSH);
+    block_acct_start(bdrv_get_stats(req->dev->bs), &req->acct, 0,
+                     BLOCK_ACCT_FLUSH);
 
     /*
      * Make sure all outstanding writes are posted to the backing device.
@@ -322,7 +323,8 @@ static void virtio_blk_handle_write(VirtIOBlockReq *req, MultiReqBuffer *mrb)
         return;
     }
 
-    bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BLOCK_ACCT_WRITE);
+    block_acct_start(bdrv_get_stats(req->dev->bs), &req->acct, req->qiov.size,
+                     BLOCK_ACCT_WRITE);
 
     if (mrb->num_writes == 32) {
         virtio_submit_multiwrite(req->dev->bs, mrb);
@@ -353,7 +355,8 @@ static void virtio_blk_handle_read(VirtIOBlockReq *req)
         return;
     }
 
-    bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BLOCK_ACCT_READ);
+    block_acct_start(bdrv_get_stats(req->dev->bs), &req->acct, req->qiov.size,
+                     BLOCK_ACCT_READ);
     bdrv_aio_readv(req->dev->bs, sector, &req->qiov,
                    req->qiov.size / BDRV_SECTOR_SIZE,
                    virtio_blk_rw_complete, req);
diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c
index bf7af9e..0d27ab1 100644
--- a/hw/block/xen_disk.c
+++ b/hw/block/xen_disk.c
@@ -493,7 +493,7 @@ static void qemu_aio_complete(void *opaque, int ret)
             break;
         }
     case BLKIF_OP_READ:
-        bdrv_acct_done(ioreq->blkdev->bs, &ioreq->acct);
+        block_acct_done(bdrv_get_stats(ioreq->blkdev->bs), &ioreq->acct);
         break;
     case BLKIF_OP_DISCARD:
     default:
@@ -518,8 +518,8 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq)
 
     switch (ioreq->req.operation) {
     case BLKIF_OP_READ:
-        bdrv_acct_start(blkdev->bs, &ioreq->acct, ioreq->v.size,
-                        BLOCK_ACCT_READ);
+        block_acct_start(bdrv_get_stats(blkdev->bs), &ioreq->acct,
+                         ioreq->v.size, BLOCK_ACCT_READ);
         ioreq->aio_inflight++;
         bdrv_aio_readv(blkdev->bs, ioreq->start / BLOCK_SIZE,
                        &ioreq->v, ioreq->v.size / BLOCK_SIZE,
@@ -531,8 +531,8 @@ static int ioreq_runio_qemu_aio(struct ioreq *ioreq)
             break;
         }
 
-        bdrv_acct_start(blkdev->bs, &ioreq->acct, ioreq->v.size,
-                        BLOCK_ACCT_WRITE);
+        block_acct_start(bdrv_get_stats(blkdev->bs), &ioreq->acct,
+                         ioreq->v.size, BLOCK_ACCT_WRITE);
         ioreq->aio_inflight++;
         bdrv_aio_writev(blkdev->bs, ioreq->start / BLOCK_SIZE,
                         &ioreq->v, ioreq->v.size / BLOCK_SIZE,
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 9f434b1..ba69de3 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -809,7 +809,8 @@ static void ncq_cb(void *opaque, int ret)
     DPRINTF(ncq_tfs->drive->port_no, "NCQ transfer tag %d finished\n",
             ncq_tfs->tag);
 
-    bdrv_acct_done(ncq_tfs->drive->port.ifs[0].bs, &ncq_tfs->acct);
+    block_acct_done(bdrv_get_stats(ncq_tfs->drive->port.ifs[0].bs),
+                    &ncq_tfs->acct);
     qemu_sglist_destroy(&ncq_tfs->sglist);
     ncq_tfs->used = 0;
 }
diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
index 4b15af1..6d52cda 100644
--- a/hw/ide/atapi.c
+++ b/hw/ide/atapi.c
@@ -110,14 +110,16 @@ static int cd_read_sector(IDEState *s, int lba, uint8_t *buf, int sector_size)
 
     switch(sector_size) {
     case 2048:
-        bdrv_acct_start(s->bs, &s->acct, 4 * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
+        block_acct_start(bdrv_get_stats(s->bs), &s->acct,
+                         4 * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
         ret = bdrv_read(s->bs, (int64_t)lba << 2, buf, 4);
-        bdrv_acct_done(s->bs, &s->acct);
+        block_acct_done(bdrv_get_stats(s->bs), &s->acct);
         break;
     case 2352:
-        bdrv_acct_start(s->bs, &s->acct, 4 * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
+        block_acct_start(bdrv_get_stats(s->bs), &s->acct,
+                         4 * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
         ret = bdrv_read(s->bs, (int64_t)lba << 2, buf + 16, 4);
-        bdrv_acct_done(s->bs, &s->acct);
+        block_acct_done(bdrv_get_stats(s->bs), &s->acct);
         if (ret < 0)
             return ret;
         cd_data_to_raw(buf, lba);
@@ -253,7 +255,8 @@ static void ide_atapi_cmd_reply(IDEState *s, int size, int max_size)
     s->io_buffer_index = 0;
 
     if (s->atapi_dma) {
-        bdrv_acct_start(s->bs, &s->acct, size, BLOCK_ACCT_READ);
+        block_acct_start(bdrv_get_stats(s->bs), &s->acct, size,
+                         BLOCK_ACCT_READ);
         s->status = READY_STAT | SEEK_STAT | DRQ_STAT;
         ide_start_dma(s, ide_atapi_cmd_read_dma_cb);
     } else {
@@ -354,7 +357,7 @@ static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret)
     return;
 
 eot:
-    bdrv_acct_done(s->bs, &s->acct);
+    block_acct_done(bdrv_get_stats(s->bs), &s->acct);
     ide_set_inactive(s, false);
 }
 
@@ -369,7 +372,8 @@ static void ide_atapi_cmd_read_dma(IDEState *s, int lba, int nb_sectors,
     s->io_buffer_size = 0;
     s->cd_sector_size = sector_size;
 
-    bdrv_acct_start(s->bs, &s->acct, s->packet_transfer_size, BLOCK_ACCT_READ);
+    block_acct_start(bdrv_get_stats(s->bs), &s->acct, s->packet_transfer_size,
+                     BLOCK_ACCT_READ);
 
     /* XXX: check if BUSY_STAT should be set */
     s->status = READY_STAT | SEEK_STAT | DRQ_STAT | BUSY_STAT;
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 43b4c1b..6fba056 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -568,7 +568,7 @@ static void ide_sector_read_cb(void *opaque, int ret)
     s->pio_aiocb = NULL;
     s->status &= ~BUSY_STAT;
 
-    bdrv_acct_done(s->bs, &s->acct);
+    block_acct_done(bdrv_get_stats(s->bs), &s->acct);
     if (ret != 0) {
         if (ide_handle_rw_error(s, -ret, IDE_RETRY_PIO |
                                 IDE_RETRY_READ)) {
@@ -624,7 +624,8 @@ void ide_sector_read(IDEState *s)
     s->iov.iov_len  = n * BDRV_SECTOR_SIZE;
     qemu_iovec_init_external(&s->qiov, &s->iov, 1);
 
-    bdrv_acct_start(s->bs, &s->acct, n * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
+    block_acct_start(bdrv_get_stats(s->bs), &s->acct,
+                     n * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
     s->pio_aiocb = bdrv_aio_readv(s->bs, sector_num, &s->qiov, n,
                                   ide_sector_read_cb, s);
 }
@@ -756,7 +757,7 @@ void ide_dma_cb(void *opaque, int ret)
 
 eot:
     if (s->dma_cmd == IDE_DMA_READ || s->dma_cmd == IDE_DMA_WRITE) {
-        bdrv_acct_done(s->bs, &s->acct);
+        block_acct_done(bdrv_get_stats(s->bs), &s->acct);
     }
     ide_set_inactive(s, stay_active);
 }
@@ -770,12 +771,12 @@ static void ide_sector_start_dma(IDEState *s, enum ide_dma_cmd dma_cmd)
 
     switch (dma_cmd) {
     case IDE_DMA_READ:
-        bdrv_acct_start(s->bs, &s->acct, s->nsector * BDRV_SECTOR_SIZE,
-                        BLOCK_ACCT_READ);
+        block_acct_start(bdrv_get_stats(s->bs), &s->acct,
+                         s->nsector * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
         break;
     case IDE_DMA_WRITE:
-        bdrv_acct_start(s->bs, &s->acct, s->nsector * BDRV_SECTOR_SIZE,
-                        BLOCK_ACCT_WRITE);
+        block_acct_start(bdrv_get_stats(s->bs), &s->acct,
+                         s->nsector * BDRV_SECTOR_SIZE, BLOCK_ACCT_WRITE);
         break;
     default:
         break;
@@ -802,7 +803,7 @@ static void ide_sector_write_cb(void *opaque, int ret)
     IDEState *s = opaque;
     int n;
 
-    bdrv_acct_done(s->bs, &s->acct);
+    block_acct_done(bdrv_get_stats(s->bs), &s->acct);
 
     s->pio_aiocb = NULL;
     s->status &= ~BUSY_STAT;
@@ -869,7 +870,8 @@ void ide_sector_write(IDEState *s)
     s->iov.iov_len  = n * BDRV_SECTOR_SIZE;
     qemu_iovec_init_external(&s->qiov, &s->iov, 1);
 
-    bdrv_acct_start(s->bs, &s->acct, n * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
+    block_acct_start(bdrv_get_stats(s->bs), &s->acct,
+                     n * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
     s->pio_aiocb = bdrv_aio_writev(s->bs, sector_num, &s->qiov, n,
                                    ide_sector_write_cb, s);
 }
@@ -888,7 +890,7 @@ static void ide_flush_cb(void *opaque, int ret)
     }
 
     if (s->bs) {
-        bdrv_acct_done(s->bs, &s->acct);
+        block_acct_done(bdrv_get_stats(s->bs), &s->acct);
     }
     s->status = READY_STAT | SEEK_STAT;
     ide_cmd_done(s);
@@ -903,7 +905,7 @@ void ide_flush_cache(IDEState *s)
     }
 
     s->status |= BUSY_STAT;
-    bdrv_acct_start(s->bs, &s->acct, 0, BLOCK_ACCT_FLUSH);
+    block_acct_start(bdrv_get_stats(s->bs), &s->acct, 0, BLOCK_ACCT_FLUSH);
     s->pio_aiocb = bdrv_aio_flush(s->bs, ide_flush_cb, s);
 }
 
diff --git a/hw/ide/macio.c b/hw/ide/macio.c
index 1b653ae..cefc85c 100644
--- a/hw/ide/macio.c
+++ b/hw/ide/macio.c
@@ -171,7 +171,7 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
 
 done:
     MACIO_DPRINTF("done DMA\n");
-    bdrv_acct_done(s->bs, &s->acct);
+    block_acct_done(bdrv_get_stats(s->bs), &s->acct);
     io->dma_end(opaque);
 }
 
@@ -352,7 +352,7 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
 
 done:
     if (s->dma_cmd == IDE_DMA_READ || s->dma_cmd == IDE_DMA_WRITE) {
-        bdrv_acct_done(s->bs, &s->acct);
+        block_acct_done(bdrv_get_stats(s->bs), &s->acct);
     }
     io->dma_end(io);
 }
@@ -370,8 +370,8 @@ static void pmac_ide_transfer(DBDMA_io *io)
         /* Handle non-block ATAPI DMA transfers */
         if (s->lba == -1) {
             s->io_buffer_size = MIN(io->len, s->packet_transfer_size);
-            bdrv_acct_start(s->bs, &s->acct, s->io_buffer_size,
-                            BLOCK_ACCT_READ);
+            block_acct_start(bdrv_get_stats(s->bs), &s->acct, s->io_buffer_size,
+                             BLOCK_ACCT_READ);
             MACIO_DPRINTF("non-block ATAPI DMA transfer size: %d\n",
                           s->io_buffer_size);
 
@@ -382,22 +382,25 @@ static void pmac_ide_transfer(DBDMA_io *io)
             m->dma_active = false;
 
             MACIO_DPRINTF("end of non-block ATAPI DMA transfer\n");
-            bdrv_acct_done(s->bs, &s->acct);
+            block_acct_done(bdrv_get_stats(s->bs), &s->acct);
             io->dma_end(io);
             return;
         }
 
-        bdrv_acct_start(s->bs, &s->acct, io->len, BLOCK_ACCT_READ);
+        block_acct_start(bdrv_get_stats(s->bs), &s->acct, io->len,
+                         BLOCK_ACCT_READ);
         pmac_ide_atapi_transfer_cb(io, 0);
         return;
     }
 
     switch (s->dma_cmd) {
     case IDE_DMA_READ:
-        bdrv_acct_start(s->bs, &s->acct, io->len, BLOCK_ACCT_READ);
+        block_acct_start(bdrv_get_stats(s->bs), &s->acct, io->len,
+                         BLOCK_ACCT_READ);
         break;
     case IDE_DMA_WRITE:
-        bdrv_acct_start(s->bs, &s->acct, io->len, BLOCK_ACCT_WRITE);
+        block_acct_start(bdrv_get_stats(s->bs), &s->acct, io->len,
+                         BLOCK_ACCT_WRITE);
         break;
     default:
         break;
diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index 14b535c..9645d01 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -183,7 +183,7 @@ static void scsi_aio_complete(void *opaque, int ret)
 
     assert(r->req.aiocb != NULL);
     r->req.aiocb = NULL;
-    bdrv_acct_done(s->qdev.conf.bs, &r->acct);
+    block_acct_done(bdrv_get_stats(s->qdev.conf.bs), &r->acct);
     if (r->req.io_canceled) {
         goto done;
     }
@@ -237,7 +237,8 @@ static void scsi_write_do_fua(SCSIDiskReq *r)
     }
 
     if (scsi_is_cmd_fua(&r->req.cmd)) {
-        bdrv_acct_start(s->qdev.conf.bs, &r->acct, 0, BLOCK_ACCT_FLUSH);
+        block_acct_start(bdrv_get_stats(s->qdev.conf.bs), &r->acct, 0,
+                         BLOCK_ACCT_FLUSH);
         r->req.aiocb = bdrv_aio_flush(s->qdev.conf.bs, scsi_aio_complete, r);
         return;
     }
@@ -257,7 +258,7 @@ static void scsi_dma_complete_noio(void *opaque, int ret)
 
     if (r->req.aiocb != NULL) {
         r->req.aiocb = NULL;
-        bdrv_acct_done(s->qdev.conf.bs, &r->acct);
+        block_acct_done(bdrv_get_stats(s->qdev.conf.bs), &r->acct);
     }
     if (r->req.io_canceled) {
         goto done;
@@ -300,7 +301,7 @@ static void scsi_read_complete(void * opaque, int ret)
 
     assert(r->req.aiocb != NULL);
     r->req.aiocb = NULL;
-    bdrv_acct_done(s->qdev.conf.bs, &r->acct);
+    block_acct_done(bdrv_get_stats(s->qdev.conf.bs), &r->acct);
     if (r->req.io_canceled) {
         goto done;
     }
@@ -333,7 +334,7 @@ static void scsi_do_read(void *opaque, int ret)
 
     if (r->req.aiocb != NULL) {
         r->req.aiocb = NULL;
-        bdrv_acct_done(s->qdev.conf.bs, &r->acct);
+        block_acct_done(bdrv_get_stats(s->qdev.conf.bs), &r->acct);
     }
     if (r->req.io_canceled) {
         goto done;
@@ -355,8 +356,8 @@ static void scsi_do_read(void *opaque, int ret)
                                      scsi_dma_complete, r);
     } else {
         n = scsi_init_iovec(r, SCSI_DMA_BUF_SIZE);
-        bdrv_acct_start(s->qdev.conf.bs, &r->acct, n * BDRV_SECTOR_SIZE,
-                        BLOCK_ACCT_READ);
+        block_acct_start(bdrv_get_stats(s->qdev.conf.bs), &r->acct,
+                         n * BDRV_SECTOR_SIZE, BLOCK_ACCT_READ);
         r->req.aiocb = bdrv_aio_readv(s->qdev.conf.bs, r->sector, &r->qiov, n,
                                       scsi_read_complete, r);
     }
@@ -400,7 +401,8 @@ static void scsi_read_data(SCSIRequest *req)
     first = !r->started;
     r->started = true;
     if (first && scsi_is_cmd_fua(&r->req.cmd)) {
-        bdrv_acct_start(s->qdev.conf.bs, &r->acct, 0, BLOCK_ACCT_FLUSH);
+        block_acct_start(bdrv_get_stats(s->qdev.conf.bs), &r->acct, 0,
+                         BLOCK_ACCT_FLUSH);
         r->req.aiocb = bdrv_aio_flush(s->qdev.conf.bs, scsi_do_read, r);
     } else {
         scsi_do_read(r, 0);
@@ -454,7 +456,7 @@ static void scsi_write_complete(void * opaque, int ret)
 
     if (r->req.aiocb != NULL) {
         r->req.aiocb = NULL;
-        bdrv_acct_done(s->qdev.conf.bs, &r->acct);
+        block_acct_done(bdrv_get_stats(s->qdev.conf.bs), &r->acct);
     }
     if (r->req.io_canceled) {
         goto done;
@@ -529,8 +531,8 @@ static void scsi_write_data(SCSIRequest *req)
                                       scsi_dma_complete, r);
     } else {
         n = r->qiov.size / 512;
-        bdrv_acct_start(s->qdev.conf.bs, &r->acct, n * BDRV_SECTOR_SIZE,
-                        BLOCK_ACCT_WRITE);
+        block_acct_start(bdrv_get_stats(s->qdev.conf.bs), &r->acct,
+                         n * BDRV_SECTOR_SIZE, BLOCK_ACCT_WRITE);
         r->req.aiocb = bdrv_aio_writev(s->qdev.conf.bs, r->sector, &r->qiov, n,
                                        scsi_write_complete, r);
     }
@@ -1498,7 +1500,8 @@ static void scsi_disk_emulate_mode_select(SCSIDiskReq *r, uint8_t *inbuf)
     if (!bdrv_enable_write_cache(s->qdev.conf.bs)) {
         /* The request is used as the AIO opaque value, so add a ref.  */
         scsi_req_ref(&r->req);
-        bdrv_acct_start(s->qdev.conf.bs, &r->acct, 0, BLOCK_ACCT_FLUSH);
+        block_acct_start(bdrv_get_stats(s->qdev.conf.bs), &r->acct, 0,
+                         BLOCK_ACCT_FLUSH);
         r->req.aiocb = bdrv_aio_flush(s->qdev.conf.bs, scsi_aio_complete, r);
         return;
     }
@@ -1649,7 +1652,7 @@ static void scsi_write_same_complete(void *opaque, int ret)
 
     assert(r->req.aiocb != NULL);
     r->req.aiocb = NULL;
-    bdrv_acct_done(s->qdev.conf.bs, &r->acct);
+    block_acct_done(bdrv_get_stats(s->qdev.conf.bs), &r->acct);
     if (r->req.io_canceled) {
         goto done;
     }
@@ -1664,8 +1667,8 @@ static void scsi_write_same_complete(void *opaque, int ret)
     data->sector += data->iov.iov_len / 512;
     data->iov.iov_len = MIN(data->nb_sectors * 512, data->iov.iov_len);
     if (data->iov.iov_len) {
-        bdrv_acct_start(s->qdev.conf.bs, &r->acct, data->iov.iov_len,
-                        BLOCK_ACCT_WRITE);
+        block_acct_start(bdrv_get_stats(s->qdev.conf.bs), &r->acct,
+                         data->iov.iov_len, BLOCK_ACCT_WRITE);
         r->req.aiocb = bdrv_aio_writev(s->qdev.conf.bs, data->sector,
                                        &data->qiov, data->iov.iov_len / 512,
                                        scsi_write_same_complete, data);
@@ -1711,8 +1714,9 @@ static void scsi_disk_emulate_write_same(SCSIDiskReq *r, uint8_t *inbuf)
 
         /* The request is used as the AIO opaque value, so add a ref.  */
         scsi_req_ref(&r->req);
-        bdrv_acct_start(s->qdev.conf.bs, &r->acct,
-                        nb_sectors * s->qdev.blocksize, BLOCK_ACCT_WRITE);
+        block_acct_start(bdrv_get_stats(s->qdev.conf.bs), &r->acct,
+                         nb_sectors * s->qdev.blocksize,
+                        BLOCK_ACCT_WRITE);
         r->req.aiocb = bdrv_aio_write_zeroes(s->qdev.conf.bs,
                                              r->req.cmd.lba * (s->qdev.blocksize / 512),
                                              nb_sectors * (s->qdev.blocksize / 512),
@@ -1733,8 +1737,8 @@ static void scsi_disk_emulate_write_same(SCSIDiskReq *r, uint8_t *inbuf)
     }
 
     scsi_req_ref(&r->req);
-    bdrv_acct_start(s->qdev.conf.bs, &r->acct, data->iov.iov_len,
-                    BLOCK_ACCT_WRITE);
+    block_acct_start(bdrv_get_stats(s->qdev.conf.bs), &r->acct,
+                     data->iov.iov_len, BLOCK_ACCT_WRITE);
     r->req.aiocb = bdrv_aio_writev(s->qdev.conf.bs, data->sector,
                                    &data->qiov, data->iov.iov_len / 512,
                                    scsi_write_same_complete, data);
@@ -1998,7 +2002,8 @@ static int32_t scsi_disk_emulate_command(SCSIRequest *req, uint8_t *buf)
     case SYNCHRONIZE_CACHE:
         /* The request is used as the AIO opaque value, so add a ref.  */
         scsi_req_ref(&r->req);
-        bdrv_acct_start(s->qdev.conf.bs, &r->acct, 0, BLOCK_ACCT_FLUSH);
+        block_acct_start(bdrv_get_stats(s->qdev.conf.bs), &r->acct, 0,
+                         BLOCK_ACCT_FLUSH);
         r->req.aiocb = bdrv_aio_flush(s->qdev.conf.bs, scsi_aio_complete, r);
         return 0;
     case SEEK_10:
diff --git a/include/block/accounting.h b/include/block/accounting.h
index ea5998d..50b42b3 100644
--- a/include/block/accounting.h
+++ b/include/block/accounting.h
@@ -48,10 +48,10 @@ typedef struct BlockAcctCookie {
     enum BlockAcctType type;
 } BlockAcctCookie;
 
-void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
-        int64_t bytes, enum BlockAcctType type);
-void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
-void bdrv_acct_highest_sector(BlockDriverState *bs, int64_t sector_num,
-                              unsigned int nb_sectors);
+void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
+                      int64_t bytes, enum BlockAcctType type);
+void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie);
+void block_acct_highest_sector(BlockAcctStats *stats, int64_t sector_num,
+                               unsigned int nb_sectors);
 
 #endif
diff --git a/include/block/block.h b/include/block/block.h
index 5fb36b1..07d6d8e 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -5,6 +5,7 @@
 #include "qemu-common.h"
 #include "qemu/option.h"
 #include "block/coroutine.h"
+#include "block/accounting.h"
 #include "qapi/qmp/qobject.h"
 #include "qapi-types.h"
 
@@ -574,4 +575,6 @@ void bdrv_io_plug(BlockDriverState *bs);
 void bdrv_io_unplug(BlockDriverState *bs);
 void bdrv_flush_io_queue(BlockDriverState *bs);
 
+BlockAcctStats *bdrv_get_stats(BlockDriverState *bs);
+
 #endif